Aom Embraer 170 Ecs System

Front 1

What does the AMS use bleed air for?

Back 1

ECS (heating & cooling)
Engine start
Pressurization
Engine & wing anti-ice
Water Pressure
Hot air leak detection

Front 2

How many AMS controllers are installed?

Back 2

One controller with 2 channels which control the respective onside system

Front 3

What happens if a channel fails?

Back 3

The remaining channel is able to control the entire AMS

Front 4

What provides air for the AMS?

Back 4

Engine bleeds
APU bleed
External Pneumatic Source

Front 5

What is external pneumatic air used for?

Back 5

ECS on the ground
Engine start on the ground

Front 6

Where is the external ground source panel located?

Back 6

Lower fairing between the wings

Front 7

What is the primary use for APU bleed air?

Back 7

ECS on the ground
Engine starting on the ground
Electrical source (up to FL330)
Assist with engine start (up to FL210)
Bleed source for pressurization, heating, and cooling (up to15,000' MSL)

Front 8

Will engine bleed air flow-back to the APU?

Back 8

No, a check valve prevents flow-back

Front 9

Where is bleed air tapped from the engines?

Back 9

6th & 10th stage compressors
System alternates between valves to regulate an adequate and safe pressure

Front 10

What is normal pressure for any engine operation?

Back 10

45 psi

Front 11

What is the purpose of the pre-cooler?

Back 11

Cools the bleed air coming from the engine to the AMS

Front 12

What cools the pre-cooler?

Back 12

Ground N1 fan
Flight N1 fan or ram air

Front 13

What does the Overheat Detection System (ODS) observe?

Back 13

Engine bleeds and packs
APU bleed
Wing and engine anti-icing system

Front 14

Do both loops have to function in order to detect on overheat condition?

Back 14

No, if one fails the other will work alone to detect the overheat

Front 15

How many ECS packs are on the airplane? What provides air for the packs?

Back 15

2 packs
Each engine provides bleed air to the respective pack

Front 16

Will a single pack provide adequate temperature control and pressurization?

Back 16

Yes, up to FL310

Front 17

Can a single bleed source power both packs?

Back 17

Yes, through a crossbleed valve

Front 18

What is the ratio of fresh air to recirculated air?

Back 18

52% fresh air / 48% recirculated air

Front 19

When are the recirculation fans commanded off?

Back 19

Cockpit switch
Smoke detected in the recirc. bay
Dump button pressed
Both packs are commanded off
Cargo bay fire signal activates

Front 20

What keeps the 3 avionic E-BAYs cool?

Back 20

FWD: 3 fans each pull air from cockpit to bay.
CNTR: 3 fans draw air from the rear cabin return and expel it towards the underfloor recirculation bay.
AFT E-BAY: Natural air-flow from cabin to bay.

Front 21

When is the Emergency Ram Air Ventilation Check Valve activated?

Back 21

Ram air pressure > cabin pressure
(Check valve on right side of system)

Front 22

How many channels on the Cabin Pressure Control (CPC)?

Back 22

2 channels, one active and one in standby mode

Front 23

Where does the CPC get Landing Field Elevation (LFE)?

Back 23

FMS or can be manually selected

Front 24

What happens when the dump button is pressed?

Back 24

Commands both ECS packs and recircs OFF
Opens OFV and raises the cabin to 12,400' at a rate of 2,000 fpm
Once the cabin altitude has reached 12,400' it commands the outflow valve fully closed. From this point the cabin altitude rises due to natural leak.
*The dump button is not avail in manual mode.

Front 25

Can the cabin altitude be raised higher than 12,400 feet?

Back 25

Yes, by using manual mode
Cabin altitude will rise due to natural leak

Front 26

In manual mode will the cabin depressurize on landing?

Back 26

No

Front 27

What is the bleed system priority in flight?

Back 27

Onside engine
Opposite engine
APU (if available)

Front 28

If engine and APU bleed air are available simultaneously, which has priority?

Back 28

APU has priority if:
The cross bleed valve is operating normally
Wheel speed < 50 kts
Wing anti-ice is not requested
Opposite engine bleed pressure is not enough for engine start

Front 29

When will the crossbleed valve automatically open?

Back 29

Only 1 side bleed source is available
Engine 2 start in the air
Engine 1 start in the air if APU is not available
APU bleed pushed out for engine start
If there is a bleed leak, the x-bleed will only open for engine starts

Front 30

When are ECS packs recovered?

Back 30

TL not at TOGA and:
Airplane is 500 AFE with both engines operating
Airplane is > 9,700' MSL with 1 engine operating

Front 31

Where does the CPCS get cruise flight level & landing elevation from?

Back 31

FMS before takeoff or CPCS calculates using ambient pressure LFE may be manually inputted

Front 32

What color is the LFE on the EICAS?

Back 32

Green FMS input
Cyan Manual input (an 'M' will be in front of LFE)

Front 33

What is the ABORT mode?

Back 33

Cabin is scheduled back to the takeoff altitude if:
Airplane stops climbing and begins a descent,
AND
Airplane has not climbed > 5,000' AFE or > 10,000' MSL

Front 34

When will the negative pressure relief valve open?

Back 34

When the differential exceeds -0.5 psi

Front 35

When will the positive pressure relief valve open?

Back 35

When the differential exceeds 8.6 psi

Front 36

What would be an indication of an engine bleed leak?

Back 36

amber stripped bar on associated bleed button

Front 37

When using manual MAN mode on the Pressurization panel, what are you manually controlling?

Back 37

The outflow valve

Front 38

When is the Emergency Ram Air Ventilation Valve commanded open?

Back 38

When both packs are commanded off and the aircraft is below 25,000 ft

Front 39

What are the different flight modes of the CPCS

Back 39

Ground
Taxi
T/O
Climb
Cruise
Descent
Ground
Abort

Front 40

Components of Air System (5)

Back 40

Cabin Pressurization Controller
Outflow Valve
Negative Pressure Relief Valve
Positive Pressure Relief Valve
Static Port

Front 41

ECS Packs Command OFF (8) plus 2 for takeoff

Back 41

No bleed source
Pack turned OFF
Any engine start on ground
Respective engine start, no WOW & opposite engine not
starting.
Any engine start & APU is bleed source
On side bleed system duct leak
Pack failure
Dump button

Front 42

ECS Packs Commanded OFF - T/O (4)

Back 42

Engine Failure & APU N/A
Thrust levers MAX & APU N/A
TDS Ref A/I set to ALL & ECS set to OFF
TDS Ref ECS set to OFF & APU N/A

Front 43

Emergency Ram air ventilation - air enters through a valve on the left side if:

Back 43

In flight AND
Both packs off/failed AND
Below 25,000'
(air will enter right side through a checkvalve when outside pressure is greater than inside)